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Events: available bytes calculation via ioctl(FIONREAD). This makes it possible to avoid looping for a long time while working with a fast enough peer when data are added to the socket buffer faster than we are able to read and process them (ticket #1431). This is basically what we already do on FreeBSD with kqueue, where information about the number of bytes in the socket buffer is returned by the kevent() call. With other event methods rev->available is now set to -1 when the socket is ready for reading. Later in ngx_recv() and ngx_recv_chain(), if full buffer is received, real number of bytes in the socket buffer is retrieved using ioctl(FIONREAD). Reading more than this number of bytes ensures that even with edge-triggered event methods the event will be triggered again, so it is safe to stop processing of the socket and switch to other connections. Using ioctl(FIONREAD) only after reading a full buffer is an optimization. With this approach we only call ioctl(FIONREAD) when there are at least two recv()/readv() calls.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 17 Oct 2019 16:02:19 +0300
parents 1cbd7f87c6ed
children 549b13cd793b
line wrap: on
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# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


if [ $USE_PERL != NO ]; then

    cat << END                                                >> $NGX_MAKEFILE

install_perl_modules:
	cd $NGX_OBJS/src/http/modules/perl && \$(MAKE) install
END

    NGX_INSTALL_PERL_MODULES=install_perl_modules

fi


case ".$NGX_SBIN_PATH" in
    ./*)
    ;;

    *)
        NGX_SBIN_PATH=$NGX_PREFIX/$NGX_SBIN_PATH
    ;;
esac


case ".$NGX_MODULES_PATH" in
    ./*)
    ;;

    *)
        NGX_MODULES_PATH=$NGX_PREFIX/$NGX_MODULES_PATH
    ;;
esac

NGX_MODULES_PATH=`dirname $NGX_MODULES_PATH/.`


case ".$NGX_CONF_PATH" in
    ./*)
    ;;

    *)
        NGX_CONF_PATH=$NGX_PREFIX/$NGX_CONF_PATH
    ;;
esac


NGX_CONF_PREFIX=`dirname $NGX_CONF_PATH`


case ".$NGX_PID_PATH" in
    ./*)
    ;;

    *)
        NGX_PID_PATH=$NGX_PREFIX/$NGX_PID_PATH
    ;;
esac


case ".$NGX_ERROR_LOG_PATH" in
    ./* | .)
    ;;

    *)
        NGX_ERROR_LOG_PATH=$NGX_PREFIX/$NGX_ERROR_LOG_PATH
    ;;
esac


case ".$NGX_HTTP_LOG_PATH" in
    ./*)
    ;;

    *)
        NGX_HTTP_LOG_PATH=$NGX_PREFIX/$NGX_HTTP_LOG_PATH
    ;;
esac


if test -f man/nginx.8 ; then
    NGX_MAN=man/nginx.8
else
    NGX_MAN=docs/man/nginx.8
fi

if test -d html ; then
    NGX_HTML=html
else
    NGX_HTML=docs/html
fi

cat << END                                                    >> $NGX_MAKEFILE

manpage:	$NGX_OBJS/nginx.8

$NGX_OBJS/nginx.8:	$NGX_MAN $NGX_AUTO_CONFIG_H
	sed -e "s|%%PREFIX%%|$NGX_PREFIX|" \\
		-e "s|%%PID_PATH%%|$NGX_PID_PATH|" \\
		-e "s|%%CONF_PATH%%|$NGX_CONF_PATH|" \\
		-e "s|%%ERROR_LOG_PATH%%|${NGX_ERROR_LOG_PATH:-stderr}|" \\
		< $NGX_MAN > \$@

install:	build $NGX_INSTALL_PERL_MODULES
	test -d '\$(DESTDIR)$NGX_PREFIX' || mkdir -p '\$(DESTDIR)$NGX_PREFIX'

	test -d '\$(DESTDIR)`dirname "$NGX_SBIN_PATH"`' \\
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_SBIN_PATH"`'
	test ! -f '\$(DESTDIR)$NGX_SBIN_PATH' \\
		|| mv '\$(DESTDIR)$NGX_SBIN_PATH' \\
			'\$(DESTDIR)$NGX_SBIN_PATH.old'
	cp $NGX_OBJS/nginx '\$(DESTDIR)$NGX_SBIN_PATH'

	test -d '\$(DESTDIR)$NGX_CONF_PREFIX' \\
		|| mkdir -p '\$(DESTDIR)$NGX_CONF_PREFIX'

	cp conf/koi-win '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/koi-utf '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/win-utf '\$(DESTDIR)$NGX_CONF_PREFIX'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/mime.types' \\
		|| cp conf/mime.types '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/mime.types '\$(DESTDIR)$NGX_CONF_PREFIX/mime.types.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi_params' \\
		|| cp conf/fastcgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/fastcgi_params \\
		'\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi.conf' \\
		|| cp conf/fastcgi.conf '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/fastcgi.conf '\$(DESTDIR)$NGX_CONF_PREFIX/fastcgi.conf.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/uwsgi_params' \\
		|| cp conf/uwsgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/uwsgi_params \\
		'\$(DESTDIR)$NGX_CONF_PREFIX/uwsgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PREFIX/scgi_params' \\
		|| cp conf/scgi_params '\$(DESTDIR)$NGX_CONF_PREFIX'
	cp conf/scgi_params \\
		'\$(DESTDIR)$NGX_CONF_PREFIX/scgi_params.default'

	test -f '\$(DESTDIR)$NGX_CONF_PATH' \\
		|| cp conf/nginx.conf '\$(DESTDIR)$NGX_CONF_PATH'
	cp conf/nginx.conf '\$(DESTDIR)$NGX_CONF_PREFIX/nginx.conf.default'

	test -d '\$(DESTDIR)`dirname "$NGX_PID_PATH"`' \\
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_PID_PATH"`'

	test -d '\$(DESTDIR)`dirname "$NGX_HTTP_LOG_PATH"`' \\
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_HTTP_LOG_PATH"`'

	test -d '\$(DESTDIR)$NGX_PREFIX/html' \\
		|| cp -R $NGX_HTML '\$(DESTDIR)$NGX_PREFIX'
END


if test -n "$NGX_ERROR_LOG_PATH"; then
    cat << END                                                >> $NGX_MAKEFILE

	test -d '\$(DESTDIR)`dirname "$NGX_ERROR_LOG_PATH"`' \\
		|| mkdir -p '\$(DESTDIR)`dirname "$NGX_ERROR_LOG_PATH"`'
END

fi


if test -n "$DYNAMIC_MODULES"; then
    cat << END                                                >> $NGX_MAKEFILE

	test -d '\$(DESTDIR)$NGX_MODULES_PATH' \\
		|| mkdir -p '\$(DESTDIR)$NGX_MODULES_PATH'
END

fi


for ngx_module in $DYNAMIC_MODULES
do
    ngx_module=$ngx_module$ngx_modext

    cat << END                                                >> $NGX_MAKEFILE

	test ! -f '\$(DESTDIR)$NGX_MODULES_PATH/$ngx_module' \\
		|| mv '\$(DESTDIR)$NGX_MODULES_PATH/$ngx_module' \\
			'\$(DESTDIR)$NGX_MODULES_PATH/$ngx_module.old'
	cp $NGX_OBJS/$ngx_module '\$(DESTDIR)$NGX_MODULES_PATH/$ngx_module'
END

done


# create Makefile

cat << END >> Makefile

build:
	\$(MAKE) -f $NGX_MAKEFILE

install:
	\$(MAKE) -f $NGX_MAKEFILE install

modules:
	\$(MAKE) -f $NGX_MAKEFILE modules

upgrade:
	$NGX_SBIN_PATH -t

	kill -USR2 \`cat $NGX_PID_PATH\`
	sleep 1
	test -f $NGX_PID_PATH.oldbin

	kill -QUIT \`cat $NGX_PID_PATH.oldbin\`
END